Codeforces Round #620 (Div. 2)Two Rabbits

A. Two Rabbits

題意:就講兩隻小兔子各在一端點往中間跳,相遇問題

傳送門

#include <stdio.h>
typedef long long ll;
int main()
{    int t;
     ll n, m, a, b;
    scanf("%d",&t);
        while(t--)
        {
            scanf("%lld %lld %lld %lld",&n,&m,&a,&b);
      if((m - n) % (a + b) == 0)
        {
            printf("%lld\n",(m - n) / (a + b));
        }
        else
        {
            printf("-1\n");
        }
            
        }
    
    
    return 0;
}